macOS: rename UpdateState.isIdle to isHidden (#13613)

macos/Sources/Features/Update/UpdatePill.swift

@@ -15,7 +15,7 @@ struct UpdatePill: View {
     private let textFont = NSFont.systemFont(ofSize: 11, weight: .medium)
 
     var body: some View {
-        if !model.state.isIdle {
+        if !model.state.isHidden {
             pillButton
                 .popover(isPresented: $showPopover, arrowEdge: .bottom) {
                     UpdatePopoverView(model: model)

macos/Sources/Features/Update/UpdateViewModel.swift

@@ -185,7 +185,7 @@ enum UpdateState: Equatable {
     case extracting(Extracting)
     case installing(Installing)
 
-    var isIdle: Bool {
+    var isHidden: Bool {
         if case .idle = self { return true }
         return false
     }

macos/Tests/Update/UpdateStateTests.swift

@@ -98,15 +98,15 @@ struct UpdateStateTests {
         #expect(state1 != state2)
     }
 
-    // MARK: - isIdle Tests
+    // MARK: - isHidden Tests
 
     @Test func testIsIdleTrue() {
         let state: UpdateState = .idle
-        #expect(state.isIdle == true)
+        #expect(state.isHidden == true)
     }
 
     @Test func testIsIdleFalse() {
         let state: UpdateState = .checking(.init(cancel: {}))
-        #expect(state.isIdle == false)
+        #expect(state.isHidden == false)
     }
 }